Sewing-machine.



' No. 635,974. Patented Oct. 3!, I899.

A. B. PETERS..- SEWING MACHINE. lpplication filed Dec. 29, 1 897.)

3 Sheets8heet -'(No Model.)

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No. 635,974. Patented Oct 3| A. B. PETERS.

SEWING MACHINE.

(Application filed Dec. 29, 1897.) (No Model.) 3 Sheets-Sh66t 2.

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No! 635,974.. Patented Oct. 3|, I899. A. B. PETERS. 4 SEWING MACHINE.

(Application filed Dec. 29. 1897,)

(No Model.)

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PATENT Erica.

ALEXANDER B. PETERS, OF LONDON, ENGLAND.

SEWING-MACHINE.

.SPECIFICATION forming part of Letters Patent N 0. 635,974, dated October 31, 1899.

Application filed December 29, 1897- Serial No. 664,217. (No model.)

T0 00 whom it may concern.-

Be it known that I, ALEXANDER BUICK PETERS, of 44E Tenterstreet, south, Goodmans Fields, London, England, have invented certain new and useful Improvements in Sewing- Machines, of which the following is a specification.

This invention relates to that class of overseaming sewing-machines in which a curved looper mounted upon an inclined shaft is employed to bring the loop of the needle-thread from below around the edge of the work and into the line of the descending needle above the work.

In the accompanying drawings, Figure 1 is a side elevation of a machine with the improvements adapted thereto, the side of the bracket-standard above the table being removed. Fig. 2 is a front elevation, partly in section, the section being taken on or about the line a: 00, Fig. 1. Fig. 3 shows my improved construction of loop-retaining finger on its slide and showing the operating mechanism in connection therewith. Figs. 4 and 5 show the throat-plate in top view and under side view. Figs. 6, '7, 8, and 9 show, detached, in side view and front viewthelooping mechanism at work in four'dift'erent positions.

To insure the'loop being carried around above the work in machines of the class named, a hook-shaped arm suitably operated has been employed to hold the loop on the point of the looper. The strain on this arm is, however, very great, and it is consequently liable toinjury.

Now the chief object of the present improvements is to overcome this difficulty. There are also several minor alterations, which, with the improvements before referred to, are the result of practical working.

A is the table of 'the machine, and A the bracket-standard.

B is a horizontal shaft by which the various parts of the machine are driven.

C is the needle, which is secured in any convenient manner to the vertically-reciprocating needle-bar Of. This bar 0' slides in guides O in the head A and is actuated by the rod D, which, extending through the table A, is connected with the crank E on the shaft B.

In practice it is found that any vibration of mental to the proper working of the machine,

and therefore the guides O are made sufficiently long to give perfect support to the needle-bar during the whole of its travel.

F is the curved looper, mounted on the end of the inclined shaft F, which axially oscillates under the influence of the toothed sector F as in other machines of the class. This curved looper has to stand considerable strain, and to enable it the better to do this its shape has been slightly modified by increasing its stiffness at the neck. This change of form enables me to employ a smaller hookthat is to say, reduce the diameter of the circle, and by this means, combined with placing the parts of the machine a little more closely together, I am enabled to reduce the throw of the crank E on the shaft B, and thus reduce the travel of the needle considerably. I may thus use a shorter needle than heretofore, which is also an element of strength, and I have, further, not so much thread to take up. All these points tend to improve the working of the machine.

The take-up which I find most satisfactory for my purpose consists of a bell-crank lever G, actuatedby a grooved cam H on the shaft B, with which engages one arm of a rock-lever I, the other arm being connected with the shorter arm of the take-up lever G. The longer arm of this take-up lever is curved at the outer end in the usual way, and its action is rendered smooth and efficient by the operation of the barrel-cam II.

In place of the hook-shaped arm before referred to which holds the loop on the looper or hook I use a retainer K, (shown detached in side view at Fig. 3,) fitted to a slide L, which works on a dovetailed guide M. This slide is operated bya rod L, attached thereto and connected with the strap of an eccentric N on the shaft B. The retainer K is wedge-shaped at its root and terminates in a forwardly-projecting point. This retainer K works in a groove a in the under side of the throat or cloth plate A and in front of the loopershaft, so that the curved looper will wrap the loop of the needle-thread over it.

- The throat-plate A is formed with a recess 17, through which the curved looper works, a

recess 0, in which the feed-dog works, and a third recess d, across which a fin ger f extends, as seen in Figs. 4 and 5.

\Vhen the looper F is about to commence its stroke, the retainer K is forward, presenting its greatest width to the loop, as seen at Fig. 6. In Fig. 7 the hook has taken the loop and is commencing to lay it over the retainer. In Fig. 8 the retainer is beginning to withdraw from contact with the loop, and in Fig. 9 the needle having caught the loop presented to it by the hook the retainer is entirely withdrawn, leaving the loop on the finger f of the throat-plate. The feed then takes place, and the loop is drawn oif the fingerfand is tightened up by the take-up, after which the looper returns to its first position ready to catch up the thread and make a new loop. This form of retainer admits of.

being made of any desired strengtlnand while it insures the loop being held on the hook it automatically presents a gradually-reduced breadth of surface to the loop, so as to allow of the loop of thread being carried up over the edge of the work.

I claim 1. In an overseaming sewing-machine, the combination with a vertically-reciprocating eye-pointed needle, of a curved looper to take the needle-thread, and carry it around above the work in the form of a loop; means for actuating thelooper; a retainer having a wedgeshaped portion with a forwardly-projecting point, and adapted to reciprocate across the path of the loop; and means for advancing the retainer and for retracting the retainer as the loop is carried by the looper around the edge of the work; a finger on the throat-plate; and a feed mechanism, as and for the purposes set forth.

2. In an overseaming sewing-machine having a curved looper to carry the loop of thread around the edge of the work, and means for actuating the looper, a retainer mounted to reciprocate across the path of the loop consisting of a tailpiece by which it is attached to a slide suitably carried, a wedge-shaped portion, and a forwardly-projectin g point and means for advancing the retainer and for retracting the retainer as the loop is carried by the looper around the edge of the work, as and for the purpose set forth.

8. In an overseaming sewing-machine, the combination of a curved looper to carry the loop of thread around the edge of the work, means for actuating the looper, a wedgeshaped retainer, and means for advancing the retainer and for retracting the wedgeshaped portion of the retainer from the loop as the latter is carried by the looper around the edge of the work, substantially as described.

4. In an overseaming sewing-machine, the combination of a curved looper to carry the loop of thread around the edge of the work, means for actuating the looper, a retainer comprising a wedge-shaped plate arranged in a plane transverse to the plane in which the work lies, and means for advancing the retainer and for retracting the wedge-shaped portion of the retainer from the loop as the latter is carried by the looper around the edge of the work, substantially as described.

5. In an overseaming sewing-machine, the combination of a curved looper to carry the loop of thread around the edge of the work, means for actuating the looper, a retainer comprising a wedge-shaped plate arranged in a plane transverse to the plane in which the work lies and a forwardly-projecting point, means for advancing the retainer and for retracting the wedge-shaped portion of the retainer from the loop as the latter is carried by the looper around the edge of the work, a finger on the throat-plate, and a feeding device to advance the work and carry the loop off from said finger, substantially as described.

ALEXANDER B. PETERS.

Vitnesses:

H. K. WHITE, FRED O. HARRIS. 

